Instruction sheet

The manufacturer should provide a dated, coded and titled instruction sheet with each delivery of adhesive. It should refer to this Specification and indicate conformance with it. It should also state

(1) the general chemical type of each component used in the adhesives

(2) recommended storage conditions and shelf life when stored under these conditions

(3) preparation instructions for steel and hardened concrete surfaces

(4) instructions for use of the primer, including optimum thickness and suggested range of permissible thickness

(5) mixing instructions, including allowable variations in mix ratio and any temperature control requirements during the mixing process

(6) application instructions, including limits on pressure, tempera­ture, open time and relative humidity before mating the faying surfaces; these should also state whether adhesive should be applied to one or both adherends

(7) maximum allowable interval between application of primer to coated steel or concrete, and application of adhesive and any primer reactivation procedure if applicable

(8) safety precautions for all components of the adhesive and primer

(9) curing conditions, including the amount of pressure to be applied, the length of time under pressure and the temperature of the assembly when under pressure; it should be stated whether this temperature is that of the adhesive layer or of

the atmosphere to which the assembly is to be maintained or both. A graph of cure time against temperature should be supplied

(10) condition procedure before testing or use of the assembled product, including length of time, temperature and relative humidity.

[1] The surface energy of a solid is roughly proportional to its Young’s modulus. Hooke’s law is really an approximation which arises from the character of the chemical bond between atoms. Thus the same interatomic forces give rise to both ‘£’ and to y.

[2] "ye is an empirical parameter, and is not the surface free energy of the solid. It equates to the surface tension of a liquid which just wets its surface with zero contact angle, and may be obtained graphically from the intercept of the plot of cos 0 against — yLV with the line cos 0 = 1.

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